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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fad1395a56ec5618af147e628515acb4170b323477c17da1c51bc3d6d06451' 
  AND token = 'zjR149DaGM78z9iuZuKiS0Azi2DoB2zDSrcaHYNNCis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}